[NETFILTER -stable]: ipt_CLUSTERIP: fix oops in checkentry function

[David Miller]

From: Patrick McHardy <kaber at trash.net>
Date: Tue, 10 Apr 2007 14:47:21 +0200

> Fix netfilter crash in ipt_CLUSTERIP. Please apply.

Signed-off-by: David S. Miller <davem at davemloft.net>